Nine of the 32 players remaining for the second week of Wimbledon are 30 or over, as average age of players rises.

Kimiko Date-Krumm remembers the good ol' days, when she used to shop in the morning, then go play tennis at night.

Those days are over - at least the shopping part.

At 42 years young, Date-Krumm is still out there, the oldest of the old in what is turning into quite a renaissance for the aging set this tennis season, and here at Wimbledon this week.

"When I was young, even during the tournament, I had energy for the shopping, but now I have no energy for that,'' Date-Krumm said on Saturday, shortly after she fell 6-2, 6-0 to the tournament's top thirty-something, Serena Williams.

In all, nine of the 32 players remaining for the second week of Wimbledon will be 30 or over, tying the Wimbledon open-era record for the fourth round, last reached in 1975. Not among those nine: 31-year-old Roger Federer, the seven-time champion, who exited early, but upon leaving, said "I still have plans to play for many more years to come.''

Vintage years

As of this week, the average age of the top 20 players on the men's tour is 27 years, 260 days - more than 2½ years older than it was 10 years ago, according to STATS Inc. And on the women's tour over the last 10 years, the average age has spiked by almost exactly two years - to 26 years, 213 days.

Players such as 31-year-old Li Na, 31-year-old Mikhail Youzhny, 31-year-old David Ferrer and 35-year-old Tommy Haas contribute to those numbers.

Also on Saturday, Haas defeated 31-year-old Feliciano Lopez in four sets - in another of a handful of matches at the All England Club involving players who were still using Walkmans when they were teenagers.

"There's no doubt that a certain type of training and proper practice and maybe even diet, all put together, can help someone stick around for a while,'' said Corrado Barazzutti, a top-10 player in the 1970s who coached Francesca Schiavone when she won the 2010 French Open.

Schiavone was less than a month shy of 30 when she took the title in Paris, making her the oldest woman since 1969 to win her first Grand Slam championship.

All of this feels like a different world to Pat Cash, the 1987 Wimbledon champion, who played in the days when the sight of a 37-year-old Ilie Nastase or a 39-year-old Jimmy Connors prowling the court wasn't unheard of but certainly wasn't as common as it is now.

"When I was playing, once you hit 30, the tournament directors wouldn't look your way if you needed a wild card to get in,'' Cash said.

Once I hit 30, they [tournament directors] completely ignored me. Now, they're realising that these players like (Lleyton) Hewitt and Haas are still drawing cards. So these players can get into tournaments, get practice and their bodies can get toughened up again after injuries more than they could 15 years ago

Former player Pat Cash,

"Once I hit 30, they completely ignored me. Now, they're realising that these players like (Lleyton) Hewitt and Haas are still drawing cards. So these players can get into tournaments, get practice and their bodies can get toughened up again after injuries more than they could 15 years ago.''

Rules that restricted the number of tournaments teenagers could play actually date to the 1990s when tours, especially the women, saw an increasing number of teens - Jennifer Capriati, Andrea Jaeger, Martina Hingis - enjoying early success, but finding themselves unable to cope with the physical and emotional strain of getting so good, so fast.

The demise of serve-and-volley, along with advances in equipment have gradually turned tennis into a slugger's affair and helped raise the level of fitness required in the sport.

Smarter approach

The grinding nature of today's tennis has, in many ways, created more injuries, but also put an emphasis on finding more ways to avoid them.

"A lot of people are smarter over the years about what to do in order to get in better shape,'' Haas said. "You have a good team around you. You can do a lot of stuff, also, nutrition-wise.''

Williams is Exhibit A on how to extend a career, though she hardly took a traditional route. Different interests and injuries dictated she miss large chunks of time over the years, which might explain how she is feeling fresh and dominating - the oldest woman to reach No. 1, at age 31. But, she concedes, she doesn't feel the same as when she was 21.

If I take a couple of weeks off, then I find that I lose my fitness quicker than what I used to. So it takes me a little bit longer to get fully back into shape. That's the only difficult part.''

Oft-injured, oft-recovered, he has risen to 13th in the world on the strength of eight appearances in quarterfinals or better in tournaments this year. At Roland Garros, he became the oldest man since 1971 to reach the quarterfinals, where he fell to Novak Djokovic. On Monday, in the fourth round of Wimbledon, he'll have a rematch and will try to become the oldest Wimbledon quarterfinalist since 1979.

"He's playing his best tennis ever, feeling so great. So fit,'' Djokovic said.

Haas simply rolls his eyes whenever he's asked about his age. Or his injuries. When someone's been around as long as he has, everything hurts.

"If you still have the desire and the will to do well, you have a lot more experience and wisdom probably in your late 20s, early 30s,'' Haas said.

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